Finding the Fourth Proportional to 152.16, 210.24 and 100.56

Step by Step Solution

1. Step 1: Write the proportion equation
   152.16 : 210.24 = 100.56 : x
2. Step 2: Convert to fraction form
   152.16/210.24 = 100.56/x
3. Step 3: Cross multiply
   152.16x = 210.24 × 100.56
4. Step 4: Simplify right side
   152.16x = 21,141.73
5. Step 5: Solve for x
   x = 21,141.73/152.16
6. Step 6: Final answer
   x = 138.94